How Straddling Pendulum Seismic Isolation Base works to protect a structure against earthquake forces The principal of base isolation is to change the "swing" frequency (fundamental frequency) of the building. We want to make the building take longer to sway back and forth, because we want to misalign the fundamental frequency of the structure with the peak frequency of the EQ. Most EQs deliver the highest force in the 1 cycle/sec range. So if we make the building take much longer, say 4 seconds

THE PENDULUM Edgar Alan Poe described the horror of being under the Pendulum in his story "The Pit and the Pendulum". How did the "pendulum" work? The torture would lasts longer as the iron blade which was fixed as high as possible under the ceiling of the room would swing back and forth. Using a special mechanism such as ones founded in old clocks alowing the pendulum to lower with each swing, rocking from side to side for hours, days even until finally reached the bottom. The victims on the be

Tests undertaken with the ‘pendulum impact device’ subject a material to repeated shocks, making it possible to determine the moment when alteration, distortion or breakage takes place. The engineers conduct experiments at three sites (the sapphire glass on the at of the watch head, at 9 o’clock, and on the crown). They also test collisions from various directions, initially for analysis, and later to ensure that the mechanism is effectively protected from excessive g-forces regardless of their

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